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W205 - C400 Rear/Trunk Rattle

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Old 11-22-2022, 09:19 PM
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W205 - C400 Rear/Trunk Rattle

Have owned the car for many years and seemed to have developed a rattling noise in the rear. I assume it might be from the trunk area or the rear seats coming in contact with the locking mechanism? Wondering if anyone here has experience this issue and the fix. The rattle noise is very prominent when going over bumpy roads or if the music plays at high bass.
Old 11-23-2022, 07:25 PM
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Originally Posted by Kurumi T
Have owned the car for many years and seemed to have developed a rattling noise in the rear. I assume it might be from the trunk area or the rear seats coming in contact with the locking mechanism? Wondering if anyone here has experience this issue and the fix. The rattle noise is very prominent when going over bumpy roads or if the music plays at high bass.
send a sound clip if u can
Old 11-29-2022, 09:18 PM
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Originally Posted by MaverickC43
send a sound clip if u can
Here is the sound clip while going over a very bumpy road. You can hear the rattles/trunk shaking noise (I assume) very prominently, after each bump (thud noise).
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received_826499298632651.mp3 (503.0 KB, 115 views)
Old 02-16-2023, 07:41 AM
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I’m not really sure but posting a comment will hopefully get some more people to take a listen
Old 02-16-2023, 08:04 PM
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Thanks,

To whomever reads, I also get some slight droning-like noise when I am in 4th & 5th gear (Sport & Sport + setting) when doing engine braking. Perhaps there is a subwoofer or speaker in the aft of the rear seats and before the trunk compartment as I can hear it when I play high bass music. Could be that these noises are connected to one another.
Old 02-18-2023, 01:12 PM
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2015 C300 4Matic Sport
Originally Posted by Kurumi T
Have owned the car for many years and seemed to have developed a rattling noise in the rear. I assume it might be from the trunk area or the rear seats coming in contact with the locking mechanism? Wondering if anyone here has experience this issue and the fix. The rattle noise is very prominent when going over bumpy roads or if the music plays at high bass.
My rear trunk rattle was from the deck edges making contact with the glass. I inserted square sponge pads in-between to fix. Also, the front glass on the passenger side.



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